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From "Goun Na (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SPARK-23627) Provide isEmpty() function in DataSet
Date Thu, 08 Mar 2018 07:32:00 GMT
Goun Na created SPARK-23627:
-------------------------------

             Summary: Provide isEmpty() function in DataSet
                 Key: SPARK-23627
                 URL: https://issues.apache.org/jira/browse/SPARK-23627
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core, SQL
    Affects Versions: 2.1.0
            Reporter: Goun Na


Like rdd.isEmpty, adding isEmpty to DataSet would useful. 

 

Some code without isEmpty:
{code:java}
if (df.count = 0) { do_something }{code}
 

Some people add limit 1 for a performance reason:
{code:java}
if (df.limit(1).rdd.isEmpty) { do_something }
if (df.rdd.take(1).isEmpty) { do_something }{code}
 

 

However, if isEmpty provided, the code will be perfect clean:
{code:java}
if (df.isEmpty)  { do_something }{code}
 

 

 

 

 

 

 

 



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